ADU Builders in Massachusetts
Massachusetts is one of the newest states to embrace statewide ADU rights, with demand surging since the 2024 law.
Permit timeline
90 days
Max size
900 sqft
Owner-occupancy
Not required
Rentals
Allowed
Cities in Massachusetts
Massachusetts ADU Law Summary
Massachusetts passed statewide ADU legislation in 2024, requiring cities to allow ADUs by-right on single-family lots, eliminating discretionary review for most projects.